ДНК-диагностика популяций коров черно-пестрой породы по локусу бета-казеина

Abstract

The allelotypes of the analyzed populations of Black-and-White cows bred in the Tver Region and the Republic of Ingushetia have been reported. The strong effects of breed and trends for its production parameters in the analyzed Black-and-White cows bred in the Tver Region and the Republic of Ingushetia, rather than the ecological impact, are revealed. The frequency of the «bad» A1 allele at a beta-casein locus was higher in the animals in the Tver Region, comprising 0,56, while the “normal” A2 allele was reported at a frequency of 0.44. Quite similar results were obtained for the analyzed cows in the Republic of Ingushetia. Thus, the frequencis of the «bad» A1 allele and the normal allele comprised 0,52 and 0,48, respectively. The findings based on the survey results can indicate that the selective breeding activity in the Tver Region herd requires a shift towards increasing the occurrence of the favourable A2 alleles due to selecting the bull sires with the target genetic traits.